Positron Emission Tomography Center

Positron Emission Tomography, or PET, is an increasingly important imaging technique that helps doctors understand cancer, heart disease and brain disorders.

 

Banner Good Samaritan Medical Center also uses PET Imaging to research Alzheimer's disease.

 

Watch a 3-D brain scan to see how PET sees the brain. Read how Banner Good Samaritan researchers use PET to detect the early stages of Alzheimer's several years before memory and thinking problems arise.

 

The PET scanner is very different from such diagnostic imaging procedures as computerized axial tomography (CT) scans, magnetic resonance imaging, ultrasound and X-ray, which show the physical structure of bones, organs and tissues inside the body. PET can display where certain chemical processes are taking place and therefore show the various organs at work in the body.

 

Information from PET scan can phyisicians if organs and tissues are diseased or healthy. PET is the only technology available that can provide this valuable information.

 

Cancer specialists now routinely use PET technology to more accurately determine the location, extent and growth rate of malignant tumors (particularly brain tumors). PET helps heart specialists identify appropriate patients for interventional cardiology procedures, such as coronary bypass surgery or a balloon angioplasty. Neurosurgeons often rely on PET to help "map" a complex brain surgery.

 

How PET Works
The body relies on glucose for energy. Before a PET scan, a patient is injected with a harmless radioactive glucose/water solution, called a "tracer." Once the tracer is inside the body, the patient is positioned into the PET scanner.As the body processes the tracer compound, positrons begin to collide with electrons, causing gamma rays to be emitted. These gamma rays are detected and measured by the PET scanner/ A computer uses the measurements to create pictures of the various organs at work within the body. The images allow physicians to differentiate healthy tissue from unhealthy tissue.

 

The PET scanner itself does not produce any radiation. It merely picks up signals from the tracers already in your body.

 

 

You may be asked some questions before your PET study. If you are pregnant or breast feeding, a PET study may not be appropriate for you. Although the amount of radiation you will receive carries no known ill effects, we prefer not to expose a fetus or young infant to unnecessary radiation. The technician will also need to know if you are diabetic and which prescribed medications you are taking.

 

Prior to your PET scan, our staff will discuss your particular procedure with you in detail so you will know exactly what to expect. Every effort is made to make patients as comfortable as possible.

 

Your visit should last two to three hours, although you will not be in the scanner the entire time. To make your visit more comfortable, wear loose, comfortable clothing to your appointment and feel free to bring a friend or family member. At some point, your visitor will have to wait in the waiting room, however we will allow them to be with you as much as possible.

 

Before your scan begins, an intravenous line will be placed into a vein in your arm for the injection of the tracer. Once inside the scanner, you will be asked to lie very still for extended periods of time.

 

Once your scan is complete, you will be encouraged to drink fluids and urinate frequently to help flush the tracer solution from your body.